This new PAINLESS lip enhancement process involves the use of a Hyaluron Pen to deliver hyaluronic acid into the lips, restoring some of its plump. What Is a Hyaluron Pen? Hyaluron Pen is a new simple device that allows the delivery through a single point of pressure to launch Hyaluron Acid mixture into human skin. It is one of the newest techniques for plumping lips and adding volume without the risk associated with needle injections. It is fast, pain-free, and non-invasive.